Cultivator
CA 2038574 A1 · Owner: Karchewski, John · Inventors: Karchewski, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary harrow blade assembly for a cultivator of the type including a drawbar for attachment to a towing vehicle, a pair of swing booms pivotally connected to the outer ends of the drawbar, and a plurality of skeletal frames extending rearwardly from the drawbar and booms for carrying packers, the assembly including tracks mounted on the packer frames, an elongated wheel frame suspended form the tracks and being movable therealong for changing the angle of inclination of the wheel frame with respect to the longitudinal axes of the drawbar and booms, and a plurality of toothed wheels mounted in the frame.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.